Miner&#39;s stay



Nov. T9; 1929.

' fwusTENHoFER MINER S STAY lFiled @11524/1926 Patented Nov. 19,1929

UNITED STA-TES JULIUs WSTENHFER, F DORTMUND, GERMANY iamnns STAY" Application led June 24, 1926, Serial No.

The invention relates to an adjustable stay or stemple for the timbering of mines consisting of two members which may be shifted one against the other like a telescope, one of these members supporting a cutting. tool which takes ofi chips from asupporting block supported by the other 'stay-member, when pressing together the stay-members, thereby absorbing the ground pressure.

According to the invention both the supporting block and the cutting tool are shaped and arranged in sucha. manner that the cutting pressure and, therefore, the cutting resistance increases with the down stroke of the stay. By this arrangement the stay is automatically adjusted to the increasing ground ressure, and the amount ofthe lati ter may e determined at any time from the relative osition of the two members. t

In or er to obtain this increasing cutting pressure the supporting block is so shaped that its widthincreases towards the end of the stroke; the supporting block embodies, for instance, the shape of Ia cone upon the surface of which the cuttino tool acts; the

supporting block may also ave the shape of a wedge, the surface of the wedge upon which the cuttingtool acts increasing towards the wedge base. The wedge shape has 33 the advantage that the cutting tool essentially acts upon a plain surface so that the tool may be -fed towards-the working surfacej after the stay has finished the stroke. Thus, the stay may be used several times successively without changing the supporting block, one layer of cutting being taken 0H with every "stroke, until the suplporting block has been completely used up.

The ess'ventialfeatures of the invention willl be ap arent from theI accompanying drawi'ng -w lich shows by way of example a pr'e- 'Iferred embodiment ofthe new stay. In the drawing Y Fig.' lis a longitudinal section seen from lthe side of the stay, Fig. 2 is a longitudinal section ontheline A'A of Fig. 1, looking from the left side in Fig. 1., and p' 1 Fig. Bis across-section on the line B-B of ting teeth arranged one after another, the

`used again, after having vreached its-lower 118,211, and in Germany August 0, 1924.

Fig. 4 is a perspective view of the supporting block and the cutting tool.

In the illustrated example, the stay essentially consists of a U- iron a, provided with a greater web height, and a U-iron b, provided with. a smaller..web height, both irons being held together by a collar c, so that they may be shiftedlongitudinally one against the other. The lower stay member L is provided with a support d, this being adjustable within a lone* hole L by means of a screw bolt f and a liey g. For making rough support adjustments, a number of holes z' is provided in the web of the 'U-iron a, which may be used selectively for adjusting the screw bolt f.

The support d serves for holding a supporting block 7c, from which'stoclr is to be removed, when the staymembers are shifted one against the other. As shown, the support Z is recessed to receive the lower portion of the block 7c, the recess being so shaped as to form a flange al engaging the relatively outer face of the block and pressing it against the inner face of the body of the stay a, whereby said block is supported and held in position. The upper member b receives a cutting tool m, the latter being guided with lateral extensions m in corresponding slots n of the U-iron flanges, so that the tool may be fed towards the'supporting block 7c by means of a screw o and a lock nut 19. The cutting tool m possesses two series of cutrear series being laterally set-over against 85 the front one in such a manner that the teeth of one series are opposite to the tooth spaces of the other series. By arranging the cutter teeth in this manner, the grooves cut by the iirst tooth series into the supporting block le will be removed by the second tooth series, the surface of the supporting block, thus, being smoothed. When lthe stay is to be stroke end, it is only necessary to vraise the upper stay member, and to advance the cut` ting tool m by the screw 0, this adjustment being stopped by the dog r projecting from the. lower end of the cutting tool, the' latter, A190.

thus, can only be advanced as far as the desired thickness of cutting is obtained.

From Fig. 2 it will be apparent that the supporting block la has the shape of a wedge, the width of the working surface increasing towards thc lower wedge end. The cutting section of the stock to be removed and, therefore, the qutting resistance increases towards the end of the stroke. According to the vertical position of the stay members the working pressure, and from the latter the corresponding ground pressure can be determined.

Of course, the invention is not limited to the embodiment shown, on the contrary other arrangements of tbe' new stay are possible without departing from the spirit'of the invention as pointed out inthe claims. For example, instead of using a wedge-shaped supporting block, the latter may also have the shape of a cone the cutterteeth acting on thel convex-surface of the cone. Moreover, the stay members may consist of tubular sections instead of U-shaped ones.

I claim:

l. A miners stay, comprising telescopic lower and upper stay-members, 'a supporting block carried by one of the said stay-members, and a cutting tool carried by the other staymember for cutting chips from the said supporting block upon a downward movement under pressure of the u per stay member, the said supporting bloc taperingtoward its upper end so that its thicknessincreases toward its lower end in the direction of'motion of the cutting tool to institute a progressively increased resistance to thev cutting action of the cutting tool,V on such downward motion of the 'upper stay member.

2. A miners stay according to claim 1, characterized by the supporting block being mounted on a support, with means for securing the support at diierent elevations t0 the stay, and auxiliary means for adjusting the support vertically for fineness of adjustment in each position in which it is secured.

3. A miners stay according to claim l, characterized by the stay-member carrying the cutting tool being provided with side flanges having slots, and the cutting tool having lateral guiding extensions engaging said slots.

4. A miners stay according to. claim l, char-- acterized by the cutting tool being mounted on the stay for adjustment toward and from thc supporting block and provided with a stop adapted to bear against the supporting block to regulate its cutting depth.

5. A miners stay according to claim 1, characterized by the"`cutting tool being provided with two series of cutting teeth arranged one after the other inthe direction of the cutting stroke and staggered with relation to one another. p

6. A miners stay according to claim l, characterized by the lower stay-member consistp height of the flanges, the upper stay-member consisting of a channel iron provided with a smaller height of the flanges, said upper member being guided within the lower member, a supporting block mounted for vertical adjustment on the body part of the lower stay-member, and a cutting tool mounted for adjustment relatively to the supporting block on the lianges of the upper stay-member.

In testimony whereof I aiix my signature.

JULIUS WSTENHFER.

ing of a channel iron provided with a greater 

